What this 4 x 2:1 multiplexer is and where it fits
The Texas Instruments SN74LS158D is a 74LS-series TTL multiplexer that selects one of two 4-bit data sources onto a single 4-bit output bus. The 4 x 2:1 configuration means four independent 2-input multiplexer channels share a common select line and a common output-enable (strobe) — a standard building block for data routing in 5 V logic systems. The 16-SOIC surface-mount package suits automated assembly on mixed-technology boards where through-hole 74LS parts are being phased out. Its 4.75 V to 5.25 V single-supply range and 400 µA / 8 mA output drive (high/low) are typical for the 74LS family, providing enough fan-out for up to ten standard LS loads per output. The commercial temperature grade (0°C to 70°C) limits it to indoor, office, or appliance environments — not for automotive or extended industrial use.
Active lifecycle — no LTB pressure for production lines
The SN74LS158D carries an Active lifecycle status from Texas Instruments, with ROHS3 compliance.
Sourcing reality — quoted to order through independent distribution
If your line needs a firm price and delivery window, submit an RFQ; the desk will check open-market inventory and factory allocation on the day.